Dental plugger



(Model.)

W. H. H. HUNTER.

DENTAL PLUGGER.

e2 Patented Deo. 12. 1882.

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V UNITED STATES PATENT ()EEICE.

WILLIAM H. E. HUNTER, E CINCINNATI, oHIo.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 268,900,A dated December 12A, 1882.

Application iiled April 26, 1882. (Model.)

Io all whom t may concern Beit known that I, WILLIAM H. H. HUN- TER, of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Dental Plnggers, of which the following is a specification.

Myinvention is in the nature of an improvement in that class of dental pluggers which are auomaticin the operation of the mallet or hammer-that is, by pressing the pointor tool against a resistance-as the foil in a toothcaviry--and pushing the barrel or case ofthe instrument tdward the point the mallet is released from its detent to give the desired blow. When the downward pressure on the barrel is relaxed the barrel and mallet are lifted back to their normal positions by an auxiliaryspring v down.

lThe objects of my invention are to provide a novel combination ot' devices for raising and releasing the mallet, to enablealong and heavy mallet to be employed, and to vary the force of the blow given by the mallet. These objects I accomplish by the mechanism illustrated in the accompanying drawings, in which- Figure 1 is alongitudinal section on the line a a: of Fig. 4, showing the mallet do-wn. Fig. 2 is a longitudinal section on the lineyy of Fig. 4., showing the mallet up. Fig. 3 is an enlarged plan of the head ofthe case. Fig. 4 is an enlarged transverse section on the line z z of Fig. l, and Fig. 5 is an enlarged transverse section ou the line s s of Fig. l.

Similar letters of reference indicate similar parts.

Ais a barrelor case ot' cylindrical form, and

4of such diameter and length as will make it convenient to handle in the ordinary operation of lilling cavities in teeth.

B is a tool ,or tool-holder, as may be preferred. If a tool-holder is desired, it is provided with a screw-socket at b, into which plugging-tools of dilierent sizes andforms may be screwed. If a tool, as shown in Figs, l and- 2, is preferred, it is made solid from end to end. and each tool must be provided with the head or shank b to pass freely within the nozzle a of the barrel or case of the instrument. The tool holder or head b ot each tool-ot' which there may be any desired number-is provided with a slot, b2, made parallel with the axis thereof, and having'a lengt-h somewhat in excess ot' the combined length of movement vof, the mallet and diameter of the catch-pin.

G is the spring-catch, consisting of thecurvedl spring c, closely fitting the nozzle a, when down, and a pin, c', which passes through the hole o5 in the nozzle arid engages with thev slot b2 of the tool B. The diameter of the pin c and width of the slot b2 are such that the former plays freely within the latter. By reason of the shoulders or stops formed bythe ends of the slot the motion of the pin o is limited bythe slot b2. The end ot' the spring o is slightly raised above the surface ot' the(v nozzle a to ena-ble the operator to lift the spring and pin c with his thumb-nail to release the tool, whereby one tool can be quickly substituted for another.

. D is the mullet, drilled centrally from end to end to embrace the piston or stem E, which vplays freely therein and rests upon the head of the tool B, as shown in Figs. l and 2.

e is a hook or catch upon the stem E, which the screw g and slot g2. (Shown in Figs. 2 and 3.) The stem E being forced laterally from its normal position by the guide-piece g far enough to disengage the hooks or catches d and e, the

which an elastic rubber band or spring H is attached to raise'the barrel or case A. of the pluggcr when the pressure in a downward di- IOS IOY

2 :scacco lection is relaxed. Thelower end of the spring I the mallet, as desired,) when l the mallet D is H is rove around the pin or stud a in the side of the barrel or case A.

a2 is an annular flange formed in the case. or barrel, at the lower end thereof, above which the head of the tool B projects slightly 'when The barrel A is pushed down as far as the slot b2 and pin c permit, wherebyI the full force of the blow ofthe mallet D is received by the tool.

d d are a pair of arms rigidly secured to and moving up and down with the mallet D in guide-slots a3 a3, cut in the barrel A. The lower ends of the arms are provided with shoulders d2 d2. which, when the barrel or case A is raised by the spring H, rest upon the bottoms of the slots a3 ai and raise the mallet to eect the engagement of the hooks or catches d and e. The length ofthe guide-slots a3 a3 is such that when the mallet D has fallen upon the bead of the tool B there is a slight clearance under the shoulders d2 d2, in order that the tool shall receive the ful'l force of the blow. The upper ends of the arms d d are provided with forks d3 d3, in which the springs F F are rove, as also' around the fixed studs or pinsu4 t4 on the barrel. The springs F are of rubber or other suitable material,ofwhich any convenient strength or number may be used.

By reference to Figs. l and 2 it will be observed thatthe malletD is turned down smaller than the diameter of the barrel, excepting at the ends, the diameters at the ends being sufciently smaller than the bore of the barrel to enable the mallet to slide freely therein.

The action of the plugger, as already imperiectly outlined, is as follows: The case or barrel A being in the elevated position, the hooks d and e engaged, and the point of the tool B rest-ing against-a resistance-as the foil in the cavity of a tooth-the barrel is grasped by the operator and pushed downward until the catches or hooks d and e are disengaged by the swell e on the stem E coming in contact with the guide-piece g, (which may be adjusted to effect a'n earlier or later release of `the tooth cavity.

driven downward by the force of the springs F F acting through the arms d d. The blow of the mallet, falling with its full force upon the head of the tool B, condenses the foil in Directly the mallet has fallen the pressure on the barrel in a downward direction is relaxed, when the case A and mallet D are lifted to their normal position by the spring H. The stem o r piston E rests upon the head of the tool B, and has no other motion than that imparted to it in a lateral direction by the guide-piece g. lThe return of the case and mallet to their normal positions is accompanied by a re-engagement of the hooks or catches d and e, when a second blow of the mallet is given by again pressing the barrel A downward toward the point. and so on foras manyblows as may be desired.

l am aware that automatic dental pluggers iu which the tool is operated upon by a reciprocating mallet driven by a spring within a case or barrel, the mallet being raised and released bythe rise and fall of the case, are not new, and this I do not claim.

Havingdescribed myinvention, whatI claim 1s- 1. The combination of a barrel or case, A, mallet D, stem E, hooks d and e, adjustable guide g, and springs F F, arranged for operation substantially as described.

2. The combination of the stem E, swell e',

guide g, provided with a slot,g, and bindingscrew g2, and the cap G, substantially as and for the purpose described. A

3. The combination of the barrel A, stud af, spring H, arm ez, stem E, and toolB, substantially as and for the purpose described. 

